28288071 has 24 divisors (see below), whose sum is σ = 46895264. Its totient is φ = 16096320.

The previous prime is 28288067. The next prime is 28288087. The reversal of 28288071 is 17088282.

It is not a de Polignac number, because 28288071 - 2² = 28288067 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16641 + ... + 18261.

Almost surely, 2^28288071 is an apocalyptic number.

28288071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28288071 is a deficient number, since it is larger than the sum of its proper divisors (18607193).

28288071 is a wasteful number, since it uses less digits than its factorization.

28288071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28288071 is about 5318.6531189766. The cubic root of 28288071 is about 304.6967190426.

The spelling of 28288071 in words is "twenty-eight million, two hundred eighty-eight thousand, seventy-one".